How to get duration, as int milli's and float seconds from <chrono>?

Question

I'm trying to use chrono library for timers and durations.

I want to be able to have a Duration frameStart; ( from app start ) and a Duration frameDelta; ( time between frames )

I need to be able to get the frameDelta duration as milliseconds and float seconds.

How do you do this with the new c++11 <chrono> libraries? I've been working on it and googling ( information is sparse ). The code is heavily templated and requires special casts and things, I can't figure out how to use this library correctly.

Answer 1

Is this what you're looking for?

#include <chrono> #include <iostream>  int main() {     typedef std::chrono::high_resolution_clock Time;     typedef std::chrono::milliseconds ms;     typedef std::chrono::duration<float> fsec;     auto t0 = Time::now();     auto t1 = Time::now();     fsec fs = t1 - t0;     ms d = std::chrono::duration_cast<ms>(fs);     std::cout << fs.count() << "s\n";     std::cout << d.count() << "ms\n"; } 

which for me prints out:

6.5e-08s 0ms